spring-HelloSpring

1.引入依赖

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.2.0.RELEASE</version>
</dependency>

2.编写实体类

package com.lv.pojo;

public class Hello {
    private String str;
    @Override
    public String toString() {
        return "Hello{" +
                "str='" + str + '\'' +
                '}';
    }
    public String getStr() {
        return str;
    }
    public void setStr(String str) {
        this.str = str;
    }
}

3.编写beans.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd">
<!--    使用spring来创建对象,在spring中这些都称为Bean
        类型 变量名 = new 类型();
        Hello hello = new Hello();
        id = 变量名
        class = new 的对象
        property = 相当于给对象中的属性设置一个值
-->
    <bean id="hello" class="com.lv.pojo.Hello">
        <property name="str" value="spring"/>
    </bean>
</beans>

4.测试

import com.lv.pojo.Hello;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    public static void main(String[] args) {
        //获取spring的上下文对象
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        //我们的对象现在都在spring中管理了,我们要使用,直接从里面取出来就可以了
        Hello hello = (Hello) context.getBean("hello");
        System.out.println(hello.toString());
    }
}

5.运行结果